{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\toprule
                    &\multicolumn{2}{c}{Workers}    &\multicolumn{2}{c}{Worker-Days}\\\cmidrule(lr){2-3}\cmidrule(lr){4-5}
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{Log Contract}&\multicolumn{1}{c}{Frac. Contract}&\multicolumn{1}{c}{Log Contract}&\multicolumn{1}{c}{Frac. Contract}\\
\midrule \multicolumn{4}{l}{\textit{\textbf{Panel A: Impact on Usage of Contract Workers}}} \\ \midrule
Post X Treat        &       -0.46***&       -0.04***&       -0.48***&       -0.04***\\
                    &      (0.09)   &      (0.01)   &      (0.09)   &      (0.01)   \\
\midrule
R2                  &        0.78   &        0.79   &        0.78   &        0.79   \\


\midrule \multicolumn{3}{l}{\textit{\textbf{Panel B: Impact on Payroll Workers and Firm Size}}} \\ \midrule
Post X Treat        &        0.22***&        0.05*  &        0.20***&        0.03   \\
                    &      (0.03)   &      (0.02)   &      (0.03)   &      (0.02)   \\
\midrule
R2                  &        0.85   &        0.94   &        0.85   &        0.93   \\
N                   &       67046   &       67046   &       67046   &       67046   \\
\bottomrule
\end{tabular}
}
